Read the Touching Letter One Cancer Victim's Mom Wrote to J.K. Rowling About "Harry Potter"

A letter that the mother of a cancer victim wrote to J.K. Rowling is going viral for expressing in the most sincere way possible why Harry Potter means so much to everyone.

The letter was written by Chrissy Hart last month and detailed how much the series helped her daughter, who passed away last week, stay strong throughout her illness.

"You taught her that for every chemo she has to go through, there will be the opportunity to fly across a lake on a hippogriff. For every time her heart seizes with fear of pain, there will be me chasing it away with a patronus charm," Hart wrote."Your words built a castle for her to move into when the prognosis got worse."

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But in addition to thanking Rowling for creating a "fortress we so desperately needed to hide in" for her daughter, she also expressed her gratitude for the courage that the series gave her as a mother watching her little girl die.

"You made me realise [sic] that a mother's courage might come in the form of her tears," she wrote. "I might not have the physical ability to block her from what will take her away from me, but I can be loving and gentle like Molly, stoic in my affection like Minerva, protective and loyal like Hermione, and waiting to welcome her home like Lily."

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The letter was read by Ellie Bamber on Saturday evening at Letters Live, an event in London in which actors read remarkable letters out loud. It was later shared by Star Wars: The Force Awakens actress Daisy Ridley on Instagram and quickly began to go viral. You can read it in full here, but be forewarned that it's a real tearjerker.

"For every child that is taken too early, people will come together, huddling close in a big group, wands held high to light the dark sky with the love they felt," Hart concluded. "You built Hogwarts as a home for her to return to. And for me."